Journal
ACS CATALYSIS
Volume 8, Issue 8, Pages 7585-7592Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00783
Keywords
hydrogen evolution reaction; N and Mn codoping; molybdenum disulfide; electronic structures; H* adsorption
Categories
Funding
- National Nature Science Foundation of China [51502174, 91645102]
- Research Foundation of China Postdoctoral Science [2017M612710]
- Shenzhen Peacock Plan [827-000059, 827-000113, KQJSCX20170727100802505, KQTD2016053112042971]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- Educational Commission of Guangdong Province [2016KCXTD006, 2016KSTCX126]
- Singapore National Research Foundation [NRF2017NRF-NSFC001-007]
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Developing economical and efficient electrocatalysts with nonprecious metals for the hydrogen evolution reaction (HER), especially in water-alkaline electrolyzers, is pivotal for large-scale hydrogen production. Recently, both density functional theory (DFT) calculations and experimental studies have demonstrated that earth-abundant MoS2 is a promising HER electrocatalyst in acidic solution. However, the HER kinetics of MoS2 in alkaline solution still suffer from a high overpotential (90-220 mV at a current density of 10 mA cm(-2)). Herein, we report a combined experimental and first-principle approach toward achieving an economical and ultraefficient MoS2-based electrocatalyst for the HER by fine-tuning the electronic structure of MoS2 nanorods with N and Mn dopants. The developed N,Mn codoped MoS2 catalyst exhibits an outstanding HER performance with 5, overpotentials of 66 and 70 mV at 10 mA cm(-2) in alkaline and phosphate-buffered saline media, respectively, and corresponding Tafel slopes of 50 and 65 mV dec(-1). Moreover, the catalyst also exhibits long-term stability in HER tests. DFT calculations suggest that (1) the electrocatalytic performance can be attributed to the enhanced conductivity and optimized electronic structures for facilitating H* adsorption and desorption after N and Mn codoping and (2) N and Mn dopants can greatly activate the catalytic HER activity of the S-edge for MoS2. The discovery of a simple approach toward the synthesis of highly active and low-cost MoS2-based electrocatalysts in both alkaline and neutral electrolytes allows the premise of scalable production of hydrogen fuels.
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